>> activists are bracing for a new battle over one of the nation's starkest political divides. >> this case is about whether the supreme court is going to adhere to an almost 50-year precedent of respecting the individual liberty to make decisions about pregnancy. >> unborn babies are human beings, and they should be protected as any human being would. >> in arguments on wednesday, chief justice john roberts signaled he might uphold the mississippi law without explicitly overturning roe. >> if it is an issue about choice, why is 15 weeks not enough time. >> he appeared to be alone as other members of the court's conservative majority went much further. republican senator susan collins has defended her vote for justice brett kavanaugh. >> he noted repeatedly that roe had been upheld by planned parenthood versus casey describing it as precedent on precedent. >> i said that it's settled as a precedent of the supreme court,